The announcement came after Bromley councillor Nicholas Bennett announced there would be “action” at the school.

spokesperson for Bromley Council said: “The suspension of the head is a matter for the Board of Governors. Bromley Council has been working very closely with the new Head of Governors at St Olave’s in response to recent events and can confirm that there will be an investigation into concerns raised, though we cannot comment further at this time.”

The school has come under fresh pressure recently from a group of current and former teachers, students, parents and governors.

The group claims there is a high level of pressure on students at the school, also claiming the suspended head took home a salary of more than £180,000 last year.

A spokesperson on behalf of Olaves Unofficial welcomed the suspension, adding: “We hope this is beginning and not the end, further action needs to be taken at the school.”

“There are concerns over pressure, we need a school that puts an arm around students’ shoulders, rather than a gun to their head.”

Chair of the school’s governing Body, Dr Paul Wright: “I have been informed that the London Borough of Bromley will be conducting an investigation of St Olave’s Grammar School in respect of concerns that have been raised over recent weeks.

“In light of this, and in order to protect the integrity of the investigation, Mr Onac has been suspended from all of his responsibilities as headmaster of the School.

“In the meantime, members of the Senior Leadership Team, along with other senior teachers, will be responsible for the day to day running of the school during Mr Onac’s absence.

“Please remember that this suspension is without prejudice and does not presume any particular outcome. We are committed to full transparency and will be cooperating fully with the local authority in this matter.”